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A preliminary notice on these compounds has already appeared in the ‘Chemical News,’ vol. xxvi. p. 279; and the present paper contains a more detailed account of my experiments. In 1864 I published an account of a crystalline teriodorcin obtained by precipitating an aqueous solution of orcin with a solution of iodine monochloride, but I found I was unable to prepare any other iodine derivative of orcin by this process. It seems probable, however, that the method devised some years ago by Prof. Hlasiwetz, and communicated by him at the meeting of the “Naturforscher und Aerzte in Innsbruck,” would yield the lower substitution compounds. This was found to be the case; for on agitating an ethereal solution containing equal molecular weights of orcin and iodine with dry precipitated mercuric oxide, the colour rapidly disappears, and monoiodorcin is formed; this may be obtained by distilling off the ether and crystallizing the residue from benzol, in order to separate an uncrystallizable oily compound which accompanies it. It is, however, still contaminated with a small quantity of mercuric iodide, which obstinately adheres to the substance, and can only be removed by recrystallization from a dilute aqueous solution of potassium iodide; this difficulty arises from the circumstance that mercuric iodide is more or less soluble in most of the liquids usually employed as solvents. For this reason I found it advisable to substitute plumbic oxide for the corresponding mercury compound originally proposed by Hlasiwetz.

II. Contributions to the history of the orcins.—No. IV. On the iodo-derivatives of the orcins